Shiite militias join the battle as Iraqis push toward Mosul

SHURA, Iraq — State-sanctioned Shiite militias joined Iraq's Mosul offensive on Saturday with a pre-dawn assault to the west, where they hope to complete the encirclement of the Islamic State-held city and sever supply lines from neighboring Syria. Other Iraqi forces aided by U.S.-led airstrikes and heavy artillery meanwhile drove IS from the town of Shura, south of Mosul, where the militants had rounded up civilians to be used as human shields. The twin thrusts come nearly two weeks into the offensive to retake Iraq's second largest city, but most of the fighting is still taking place in towns and villages far from its outskirts, and the entire operation is expected to take weeks, if not months. The involvement of the Iranian-backed Shiite militias has raised concerns that the battle for Mosul, a Sunni-majority city, could aggravate sectarian tensions. Rights groups have ...